MALOUF SLEEP TITE FIVE-5IDED Hypoallergenic Mattress Protector - 100% Waterproof - 15 Year U.S. Warranty - TWIN XL Five-sided coverage protects the top and sides of your mattress from liquids, allergy-causing dust mites, and bacteria Lab-certified 100% Waterproof - H2Pro membrane repels all liquids including bodily fluids, perspiration, urine and accidental spills Universally-sized, fully-elasticized fitted sheet style fits all mattress depths from 6 to 22 inches Ultra-thin, breathable material is whisper quiet, prevents overheating, and when used properly under a fitted sheet will not change the feel of your mattress. 15-year U.S. warranty covers manufacturer's defects, product performance and workmanship